Etymology
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hedgehog (n.)

mid-15c. (replacing Old English igl), from hedge (n.) + hog (n.). First element from its frequenting hedges; the second element a reference to its pig-like snout.

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Definitions of hedgehog

hedgehog (n.)
relatively large rodents with sharp erectile bristles mingled with the fur;
Synonyms: porcupine
hedgehog (n.)
small nocturnal Old World mammal covered with both hair and protective spines;
Synonyms: Erinaceus europaeus / Erinaceus europeaeus
From wordnet.princeton.edu